Chemistry concepts and calculations

1. A student obtained a test tube with asuspension of white, slightly soluble ma

1. A student obtained a test tube with asuspension of white, slightly soluble magnesium hydroxide in water.This system was at equilibrium as represented by the followingequation: …

1. A student performed two m.p. determinations on a crystalline product whose re

1. A student performed two m.p. determinations on a crystalline product whose reported m.p. is 1430C. Data for the two determinations are as follows: Sample #     m.p. range, 0C  …

1. A student performs the following steps to isolate biphenyl from a solid 1:1 m

1. A student performs the following steps to isolate biphenyl from a solid 1:1 mixture of biphenyl and salicylic acid. a. Dissolve 2.0 grams of the mixture in 20 mL of ether b. Ex…

1. A student performs the following steps to isolate biphenyl from a solid 1:1 m

1. A student performs the following steps to isolate biphenyl from a solid 1:1 mixture of biphenyl and salicylic acid a. Dissolve 2.0 grams of the mixture in 20 mL of ether b. Ext…

1. A student prepared a base solution using 7 mL of 6M NaOH diluted with distill

1. A student prepared a base solution using 7 mL of 6M NaOH diluted with distilled water to a final volume of approximately 400 mL. The student titrated a standardized solution of…

1. A student prepared a base solution using 7 mL of 6M NaOH diluted with distill

1. A student prepared a base solution using 7 mL of 6M NaOH diluted with distilled water to a final volume of approximately 400 mL. The student titrated a standardized solution of…

1. A student prepares a 250.0 mL solution using 41.7 grams of potassium nitrite.

1. A student prepares a 250.0 mL solution using 41.7 grams of potassium nitrite. They then take 29.9 mL of this solution and dilute it to a final volume of 250.0 mL. How many gram…

1. A student ran the following reaction in the laboratory at 590. K: CO(g) + Cl2

1. A student ran the following reaction in the laboratory at 590. K: CO(g) + Cl2(g) COCl2(g) When she introduced CO(g) and Cl2(g) into a 1.00 L evacuated container, so that the in…

1. A student reacts 1.60 ml of 15.7M HNO3 with 0.5000g of copper metal. Determin

1. A student reacts 1.60 ml of 15.7M HNO3 with 0.5000g of copper metal.  Determine the limiting reactant and the amount of excess reactant (in moles) left over, assuming the react…

1. A student reported the mass of 10 glass beads as 2.507 +- 0.015g. What should

1. A student reported the mass of 10 glass beads as 2.507 +- 0.015g. What should the student report as the mass of one bead? Explain your answer 2. A student reported the density …

1. A student reported the mass of ten glass beads as 2.507 ± 0.015 g. What sho 4

1. A student reported the mass of ten glass beads as 2.507 ± 0.015 g. What sho 4. A student noticed that the average diameter of as the mass of one bead? Explain your answer. uid …

1. A student standrdized a NaOH soln. using 15.00mL of 0.250 M HCl as a primary

1. A student standrdized a NaOH soln. using 15.00mL of 0.250 M HCl as a primary standard. Titration required 42.73 mL of NaOH. Cal the molarity of NaOH soln. 2. A NaOH soln of unk…

1. A student started with 20 grams of a fat (with a formula weight of 696 grams/

1. A student started with 20 grams of a fat (with a formula weight of 696 grams/mole). The student follows the procedure given in this experiment except that the student used 3.25…

1. A student studies the kinetics of reaction 1 below using a clock reaction tec

1. A student studies the kinetics of reaction 1 below using a clock reaction technique, reaction 2, and the procedures given in this experiment. For reaction mixture 1, he measure…

1. A student studies the kinetics of reaction 1 below using a clock reaction tec

1. A student studies the kinetics of reaction 1 below using a clock reaction technique, reaction 2, and the procedures given in this experiment. For reaction mixture 1, he measure…

1. A student was in a hurry to carry out this determination and took some shortc

1. A student was in a hurry to carry out this determination and took some shortcuts in doing the experiment. Briefly explain whether each of the following changes would lead to hi…

1. A student was tasked to repeat this experiment three times byexactly the same

1. A student was tasked to repeat this experiment three times byexactly the same procedure in order to estimate the experimental uncertainty in the determinationof optical rotatio…

1. A student weighs 30.0 mL of an unknown liquid and finds its mass to be 20.86

1. A student weighs 30.0 mL of an unknown liquid and finds its mass to be 20.86 g. Calculate the density of the unknown liquid. (Remember to always include units and report the an…

1. A student who is performing this experiment pours an 8.50 mL sample of the sa

1.      A student who is performing this experiment pours an 8.50 mL sample of the saturated borax solution into a 10 mL graduated cylinder after the borax solution had cooled to …

1. A student who was in a hurry to complete this experiment did not follow the e

1. A student who was in a hurry to complete this experiment did not follow the exact directions for some of the procedural steps. Briefly explain what effect, if any, the followin…

1. A student who was performing a distillation for the firsttime failed to posit

1. A student who was performing a distillation for the firsttime failed to position the thermometer correctly. The bulb was settoo high. What effect would this have on the observe…

1. A student wishes to recrystallize a sample of 4-bromobenzoic acid. How much b

1. A student wishes to recrystallize a sample of 4-bromobenzoic acid. How much boiling water would it take to dissolve 5.0 g? 2. After adding the 5 g of 4-bromobenzoic acid to wat…

1. A substance decomposes in a first-order reaction with a rate constant of 6.70

1. A substance decomposes in a first-order reaction with a rate constant of 6.70 x 10–4 s –1 . If the initial concentration of the substance is 1.50 M, what is its concentration a…

1. A substance has solubility of 64g in 100g water. Adding 32g of the substance

1. A substance has solubility of 64g in 100g water. Adding 32g of the substance to 50g water, the resulting solution is: A. saturated B. none of these C. unsaturated 2. Calculate …

1. A teaspoon containing 3.3g of sucrose is added to a cup of tea. How much ener

1. A teaspoon containing 3.3g of sucrose is added to a cup of tea. How much energy, in kilocalories, are in the sucrose if 1g of sucrose provides 4kcal 2.How much grams of ATP (50…

1. A thermodynamic cycle is a set of steps that returns the system to the same s

1. A thermodynamic cycle is a set of steps that returns the system to the same state that it started from (see, for example, pages 118 and following in the text). For each of the …

1. A titration is a stoichiometrically controlled reaction involving an acid/bas

1. A titration is a stoichiometrically controlled reaction involving an acid/base neutralization reaction. The net ionic reaction for an acid/base neutralization reaction is best …

1. A user must be able to enter first name and last name, in that order, and you

1. A user must be able to enter first name and last name, in that order, and you assign five random lottery numbers to that person and let the user enter names until they want to …

1. A valid lewis structure of _____ cannot be drawn without violating the octet

1. A valid lewis structure of _____ cannot be drawn without violating the octet rule. A) PCI3 B) SO3 C) CCI4 D) CIF3 2. Which of each pair is the more polar bond? Pair I: F---O vs…

1. A voltaic cell consists of a copper electrode in a solution of copper(II) ion

1. A voltaic cell consists of a copper electrode in a solution of copper(II) ions with unknown concentration, and a palladium electrode in a 0.1 M solution of palladium(II) ions. …

1. A voltaic cell is constructed using zinc metal in 0.1 M ZnSO4 solution and ni

1. A voltaic cell is constructed using zinc metal in 0.1 M ZnSO4 solution and nickel metal in 0.1 M NiSO4 solution. What is the reaction that is happening at the anode? Zn2+(aq) +…

1. A voltaic cell is constructed with a Cd metal strip in 0.07 M Cd(2+) in one h

1. A voltaic cell is constructed with a Cd metal strip in 0.07 M Cd(2+) in one half cell, and a Cu metal strip in 0.70 M Cu(2+) in the other half cell, in the same configuration a…

1. A voltaic cell made of a Cr electrode in a solution of 1.0 M in CR 3+ and a g

1. A voltaic cell made of a Cr electrode in a solution of 1.0 M in CR3+ and a gold electrode in a solution that is 1.0 M in Au3+. .Provide the half cell reactions for each of the …

1. A voltaic cell prepared using aluminum and nickel has the following cell nota

1. A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s) Which of the following reactions occurs at the anode? A)…

1. A volume of 25.00 mL of a manganese(II) solution is titrated in basic conditi

1. A volume of 25.00 mL of a manganese(II) solution is titrated in basic conditions with a volume of 34.77 mL of 0.05876 M KMnat. Determine the concentration of manganese(II) ions…

1. A weakly acidic drug molecule has a pKa of 8. At what pH will this drug be 35

1. A weakly acidic drug molecule has a pKa of 8. At what pH will this drug be 35% ionized? Report to one decimal place. 2. Ibuprofen is an acidic drug with a pKa of 4.9 and a form…

1. A well-insulated 7.00 kg glass bowl [c=840J/(kg. o C)] contains 16.0 kg of pu

1. A well-insulated 7.00 kg glass bowl [c=840J/(kg.oC)] contains 16.0 kg of punch, (essentially water) [c=4186 J/(kg.oC)] , at 25 oC. Now 2.50 kg of ice [c= 2100 J/(kg.oC)] is dum…

1. A(g) + 2B(g) 2C(g) If K p for the above reaction is 4.50 x 10 -2 , in what di

1. A(g) + 2B(g) 2C(g) If Kp for the above reaction is 4.50 x 10-2, in what direction will the reaction proceed to establish equilibrium if the pressures of A, B, and C are 0.250 a…

1. A) Assume Class A glassware for all calculations (tolerance of +/- 0.1%). Jan

1. A) Assume Class A glassware for all calculations (tolerance of +/- 0.1%). Janice prepares 500 mL of a 45 millimolar stock solution of HCl by diluting 50.0 mL of a 450 millimola…

1. A) In the compound MgF2, what is the oxidation number for magnesium? a. 1 b.

1. A) In the compound MgF2, what is the oxidation number for magnesium? a. 1 b. 2 c. -1 d. -2 B) In the compound Na2SO4, what is the oxidation number for sodium? a. 1 b. 2 c. -1 d…

1. A)Determine the rate law of the reaction and find the value of the rate const

1. A)Determine the rate law of the reaction and find the value of the rate constant (k) with proper units.    2O3 3O2 Experiment #    Initial [O3] (M)    Initial Rate (M/sec) 1 0.…

1. A. Briefly explain why hydrogen atoms in methane are all in equivalent positi

1. A. Briefly explain why hydrogen atoms in methane are all in equivalent positions? B. Briefly explain why there are no structural isomers of propane (c3h8) C. Briefly explain ho…

1. A. Briefly explain why hydrogen atoms in methane are all in equivalent positi

1. A. Briefly explain why hydrogen atoms in methane are all in equivalent positions? B. Briefly explain why there are no structural isomers of propane (c3h8) C. Briefly explain ho…

1. A. Define specific heat B. Why do you have to transfer the copper rapidly fro

1. A. Define specific heat B. Why do you have to transfer the copper rapidly from the boiling water into the calorimeter? C. what error would be committed if the boiling water did…

1. A. E2 shows a Primary (Deuterium) Isotope Effect. What is a Primary (Deuteriu

1. A. E2 shows a Primary (Deuterium) Isotope Effect. What is a Primary (Deuterium) Isotope Effect? B. According to this is hydrogen lost at a fast or slow step? 2. A. E2 shows a (…

1. A. E2 shows a Primary (Deuterium) Isotope Effect. What is a Primary (Deuteriu

1. A. E2 shows a Primary (Deuterium) Isotope Effect. What is a Primary (Deuterium) Isotope Effect? B. According to this is hydrogen lost at a fast or slow step? 2. A. E2 shows a (…

1. A. HCl does not appear in the equilibrium reaction between barium ion and chr

1. A. HCl does not appear in the equilibrium reaction between barium ion and chromate ion, yet it affects the reaction. Explain, making sure to use any relevant chemical equations…

1. A. Write equations that show the processes that describe the first, second, a

1. A. Write equations that show the processes that describe the first, second, and third ionization energies of a boron atom. (firts stage) B. Express your answer as a chemical eq…

1. A25.0 mL sample of 0.100 M lactic acid (hc3h5o5, pka= 3.86) is titrated with

1. A25.0 mL sample of 0.100 M lactic acid (hc3h5o5, pka= 3.86) is titrated with a 0.100 M NaOH solution. Calculate the pH after the addition of 0.0, 4.0, 8.0, 12.5, 20.0, 24.0, 24…

1. ARP [2] Which of the following is/are true: An ARP message, ?? a. is encapsul

1. ARP [2] Which of the following is/are true: An ARP message, ?? a. is encapsulated in an IP-datagram ?? b. has its own Ethernet frame type ?? c. is sent in order to find the MAC…